Three-dimensional deterministic block analysis model for information-oriented excavation design

An algebraic algorithm has been developed for predicting the formation of three-dimensional tetrahedral blocks on the excavation surfaces based on the orientations and locations of discontinuity planes obtained from DOM drilling operation. Traces of discontinuity planes on the excavation surface have been predicted by adopting the algebraic projection technique and the persistence of discontinuity has been considered to determine the extent of trace on the projecting plane. Formation of potential tetrahedral blocks has been algebraically discerned by utilizing the plane equations of discontinuities. Three-dimensional geometry of each individual block is precisely defined and stability of each block subject to the body weight is estimated by considering both the kinematic behavior and the mechanical properties of block forming discontinuity planes. Practical applicability of block model is illustrated by performing the block analysis for the underground tunnel excavation.

► Deterministic three dimensional block analysis model has been developed.
► Kinematic behavior and stability of hazardous tetrahedral block can be analyzed.
► This model can also simulate the consecutive tunnel excavation process.
► With available in-situ data information-oriented excavation design would be achieved.